package com.lanyun.yebdemo.config.jwtconfig;

import com.lanyun.yebdemo.utils.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {


    @Value("${jwt.tokenHeader}") //
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                    FilterChain filterChain) throws ServletException, IOException {
        String header = httpServletRequest.getHeader(tokenHeader);
        if(header!= null && header.startsWith(tokenHeader)){
            String authToken = header.substring(tokenHead.length());
            String username = jwtTokenUtil.getUserNameFromToken(authToken);
            if(username!= null && SecurityContextHolder.getContext().getAuthentication()!=null){
                UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                // 是否合法
                if(jwtTokenUtil.validateToken(authToken, userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                    authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(httpServletRequest));
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }
        }
        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }
}
